<template>
  <div class="todo-container">
    <div class="todo-wrap">
      <MyHeader :addTodo="addTodo" />
      <MyList
        :todoList="todoList"
        :changeStatus="changeStatus"
        :deleteTodo="deleteTodo"
      />
      <MyFooter
        :todoList="todoList"
        :checkAllTodo="checkAllTodo"
        :deleteAllTodo="deleteAllTodo"
      />
    </div>
  </div>
</template>

<script>
import MyHeader from './components/MyHeader';
import MyList from './components/MyList';
import MyFooter from './components/MyFooter';

export default {
  name: 'App',

  components: { MyHeader, MyList, MyFooter },
  data() {
    return {
      todoList: JSON.parse(localStorage.getItem('todoList')) || [],
    };
  },
  methods: {
    //往todoList里面添加元素
    addTodo(todoObj) {
      this.todoList.unshift(todoObj);
    },
    // 改变todo状态的方法,通过props传给list,list再通过props传给item
    changeStatus(id) {
      this.todoList.forEach(todo => {
        if (todo.id === id) {
          todo.status = !todo.status;
        }
      });
    },
    // 根据id删除todoList中的元素
    deleteTodo(id) {
      this.todoList = this.todoList.filter(todo => todo.id != id);
    },
    checkAllTodo(check) {
      this.todoList.forEach(todo => (todo.status = check));
    },
    deleteAllTodo() {
      this.todoList = this.todoList.filter(todo => !todo.status);
    },
  },
  watch: {
    todoList: {
      deep: true,
      handler(value) {
        localStorage.setItem('todoList', JSON.stringify(value));
      },
    },
  },
};
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>
